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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1624dba5af9d0c9fe8ad49f72d3a1e9fea52c12e80df8cb7eafc5f19b7612a9f' 
  AND token = 'YVbGvztPUAAMacTrqiuXVm8OXflecQSri30/jD6HW1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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