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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eb4eeaa32baa883ddde860869b40dc67afef509bec9d4a6b93adaa9933b86fe' 
  AND token = 'fXQR03kyoHCHOF/aeWLhxb2ykbxlVEaSVVeoecCn+b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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