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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab84c933612951cb7b468010f188928b6d19c3fcf7a665b24ad0b9d943c1a65' 
  AND token = '45gHaw0pT3SZCD9sdR8W783TEqJCTApItIdtrI2yYQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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