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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8349077a0829d1627444e839a78b320ba1a2200a0a9eb92c2de1db95296387d' 
  AND token = 'CscwzksfBRtJzOGoftc3eRWv2QMmjgkqgZlis7QwgCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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