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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd441d804bafba142c45a05c0d2bc6a2b1e2c5c9ea492353d24fb237117e3a226' 
  AND token = 'mk6UavH669nkso5eoP8NSOz1lrB681PPskghq7S6OXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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