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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7caf448ed391604592a68a4903cadbb662139753ac662e846bbbc7c6059262' 
  AND token = 'fWC14l9r/4DTs/QhoCWbYx+zNpcszpA1bJOVxpo8sbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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