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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6083ed826937a4553ae1f593f0966c88ce504cd3d33ace306eddf60e4f91fc5e' 
  AND token = 'Mqj4P6M28SlXiXX7IYhagMPpifYBgvmFBaJ8nEYOm4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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