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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6221984af360ac8f76d7cb5a5a02394e51ec6ae582d4f23cfb6a14f641ea398a' 
  AND token = 'rdaVPFhsb3jShE9C2aLPKvA+KStJkcQqybHyh2ZQDW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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