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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff105e6502014b74f340fc9154fd0401a055a924f384bf1943a93a9ee483fbc' 
  AND token = '1CPdTF75J5No30IWjyBqk2x4xyl8rUTeW7kemcR7R1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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