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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf278c56bf1b9ed41ac1d5b887d81299cf29c19373e2a9a6ffb69cf373bbcbfb' 
  AND token = 'nBNOp67A/iW0EtanBuD7JrFEAUF77K0BYYGhrGpwysY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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