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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd459d0a903a18c17f05a7223e01ec8d9897db18576ab4cb5cc896dd416f4c95b' 
  AND token = 'TKAbr0weE5wVMVXcNsR23ZRoBmqblV37/ZqG741Jk8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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