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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d71e7d69b7eeca2f8a021957b24e239ee905899b2862d0a2b79d3177f07451' 
  AND token = 'sP/oQIPpCEbghZdL0GFxjPUyzSFIgmMUDDSWMkIzLCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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