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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ff007214a6366638c78abc8544eb9504a2d7b835b00b4da932bd5df233d0882' 
  AND token = 'qeoTPnGW8xrQmu1zM1khz98mntuZCbqnBS0/zYyo9g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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