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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c09fd6649f8b8186eb9811f94976c073ca16742adb5569bf323f5a43c14e1f3' 
  AND token = 'y3JktrUIxK2Kb00N/pIaqWS7GatxoT3f2LkJ5PrfHZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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