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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f8748063bf3f0271d298e524a7dbc6865c1383b08ac24a14147e97ab798765a' 
  AND token = 'TfpHNPj7iZ38Kt0btQcf81M9qaKa3jhdC5neEETejuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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