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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7399c582897c66652ac0aec7241d3607ca2ab95d4e8a9b1cf57fbe59f42900ec' 
  AND token = 'M6vfH8xdYrjcBm6bNtcOWpy/Bj9Ztm7wBqPKGgmU80Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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