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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19410b8445a0f5336914c3d17778eef2ddcef38007036183faec7c8e55f3fd40' 
  AND token = 'akL1tqbHmWMLQjfBIHwqIsOVB2moEYm1nOfSOp5YWKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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