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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4cc36081309002a1d20e091d5451e847f08802b407b98a8960084e95800d07a' 
  AND token = '868MHcf2Y5AvA1MQZnSggbH3a5/cBEvpyX6Sq9F23j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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