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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f9c4fa81fa1ac0726fec1803a1986edfd6e1600ef2dba2bc28d53a9c8b8352' 
  AND token = 'mJTu/gCLbr7H2CegR+iFAs/GcLChXumoQRAsaHkaLsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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