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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a0035aad322986c042ba6b35a1bd49e0f5b9c4401c43745ab2bef969084ab72' 
  AND token = 'svEzeY6LqLxhhCTB8Z7yt8k33iF0sUe5VyR0GGgvnp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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