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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b573423b680c65db6b2a1617c5d04d88b360d1e6d7e959c7afc3728438990fec' 
  AND token = '246H0Ym+P3RsirlKXv8KX9uo0sIZc4TycNvR1gBYrQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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