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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e48cf1a8254fa544d530477c39364755c0967fb64b616002c002aed50be1835a' 
  AND token = 'Nacm5JTLiPH10vxD2rJFOaru3D1DvexePQm0HekrqSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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