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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6173116608b9182b5e35c69dbccc6630f82673e11962943f5a44606f3d2f97a3' 
  AND token = 'H5LtStZ6pFrHX0kjQsmJU2IPafLO5H649DaorBzPHL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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