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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b9c4f98956f32e22f9c31ebfc2d990dd178364a6192d533ebf13037bc1e922' 
  AND token = 'Z4mnJie2wrnJttT3iNk6ZCL6suvmOc2f+qBoApQXES0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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