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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5667d4756a9439454a5025ea40b357338a629ab45c4c0160fa66910716675f84' 
  AND token = 'fQngrDXyE0cgMHhS26SZFqb+vn6l8Zy4de/JmyNwoK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}