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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2e18f9ac6cefd812ea5383882cc3ac885cc7f2973be88128c9cf51b389ff0a1' 
  AND token = 'A+V3rJxY+OaLDi7nCS0QqivDYZJ2M0zHNR9wfDo8zVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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