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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b53a9362e2392afb253a7a1efbf06b828e0dd352e1c763d2da262c7e1a74d7' 
  AND token = '63iVWwp1WBzkGvz8t4au7btKiyOzLhcXwJ2j6UqSw0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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