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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90845571fa057bcf7098825f1583a798f7af39d58b540ef856eda8935f44d625' 
  AND token = 'wMaAV9a6g/1HLnFNZOx0cecOtXXjg+02/Nd9WHm5LJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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