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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584516f63bb3c998a1a25a5116afc84b6ddbc5bd0622d37da8b262552eee8411' 
  AND token = 'OHkflYP7lct0/7c9o+1lKkbjF7piJqVgoj9ewo2rfUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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