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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ec2a6c36f88e01b17bee1f64c49b7a1fef043ce7c51a5b7729b270892dd025' 
  AND token = 'O/pEd1IHJZ86HIR3yeILsnm2tX8aDF7mbFPsYVKsews=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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