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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc0e765f270679445425c50a59b9650e20cacff448b6b4938cb8fde1c49886e' 
  AND token = 'y2Re6pUxogrE3pdi3g+7G3SJ2xu4L91IClxVdbpFQ9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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