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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36255c62f54c1865bc630b4207d4287327897919d932c1a6183e5c111007b18' 
  AND token = 'R6oLv9lpFelonHXpepXD2v911ZNACIptkghiiCfo8KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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