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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe6cc39d7dcb9fa5c270c3b7d4353ef7642e6ebbd4714fd9f5661f1136e662a' 
  AND token = 'Pt4EyAcshS+BR66fCmWtLMcsYUpRhPJ/h2aH01g63Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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