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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46f09b0ca1a384ef6a21477a519943825ad6372211df51fe1bc9928a79beaaf3' 
  AND token = 'yK9JUyZDLRoAORYrYshvD3uT2p85s5bO3b+M3TKrcDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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