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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d0e0721e0bdc81ff2cea98eb8355b4f3c0e5cae9d810af59ea833d86edffb15' 
  AND token = 'NQurH+QEbEJCo6m3KYKaz/snif42uk3D0Ly/725Csos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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