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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93617d8d8c025a77a34a650e7d31faf28c973d78c80c035d1e3ccc3ffa7764e1' 
  AND token = 'JyG+drnA9Q4QSNVDcrtJsg6P4FMEn5s1N5a/Yr4LJqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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