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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d732500b1223b94ea7a452dfc4b4562fff88f3e7f54ef61b67191fe37ccb177' 
  AND token = 'd01DE8210Mh8xP8N/1+uslNFuuzbmtAWnntv0+P4FXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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