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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c63f219b949872cc288a178ffc6ef95225fdbf6c0de11af49af6bb979fb48d9' 
  AND token = 'jdpor4w5sC8aR/eKVy19bqDB3913G2MU0Dw22TbPvkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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