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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec2d60e12875b6899cae4517713d505cbaa3d3f31c8e313e5da9c64e1711b720' 
  AND token = 'Ij7qcfsGKFDzVpeDs4RabkmapwCVAaN0ltVw441C+NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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