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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b2d133ccfe3ed0b4f75fabe484dd32322131f52424fa8b56a962cf0643a812d' 
  AND token = 'Diz35Zn+XqOV7JtToyEMX8ONd/uUJ76ZfU3gPyPJxFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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