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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd69ccd8cad69fe41f8299244cfcf6d1daf2f02d7e864eea4200796df7a0c8ef' 
  AND token = 'REDJg0BYAn/9re20BkW8RT6/Tf61Jrum9TQnmvZIc08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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