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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b36cbf8cca97bb2e11ed949c8f457017730c1f90dbe5cf879a283d9621b279' 
  AND token = '84VMg1cDsLDm/BPVZE+UBlVU8uVupM+chTVNtWcu8aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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