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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81d360052cb25c965e6cb907aff001815f1e466824efacdc0563b7ce97d8e819' 
  AND token = 'r0oscnlHYRMqDFtpwgy1CH7en8p/wOcCfM0ExBvSgLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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