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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7686338b3e14bd357eae5fa1bebf8a7425659143c86b87ad582ae4f4c102c7' 
  AND token = 'XvMRMMq+5U0QKg4azfHOHLDYKbtDTxEgtV6Tpcc16rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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