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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f023de8ca23edc3bbefb02b31095b7e0828881ba49fae92d4f43702d4284c3f' 
  AND token = 'pEpDuPHaKGqTWHoxAruF8hklEzV8ndXwfjZ5nD/qAv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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