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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0a653254749bfe17c312244016c748558f3f266e43eb3dd70a1d20efbd196c' 
  AND token = 'xyP7sGdzbiuR3++I0WK/go8qxrXAroascv6MeOC9/RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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