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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47aa6206f42fdd9daaa9785b18035a2cb7816444acde88eb5bc9b05c8246fae' 
  AND token = 'oeNteReHhD6jgfmsQmPbhmtRCO4FDAEO7U7eoA2C0ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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