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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '081a1d3ce261c86b81df132804eafe78989c0949ddaa27113425dd7e556ba8e1' 
  AND token = 'BC1/yjs8hWdMYPS0Q8TrSySlYasI377FiS95tv+1rOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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