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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102e5b793d6c9c77382a11509611fd1633f164c6af1eef37006ab50d8ab7d5f5' 
  AND token = 'LlNA7f1D+EsKo0AH3DqIK1SrPQrbaBFIekINMc9PBxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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