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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c64b09e0d872b6b8a8e16907507aadc7d4c530e37e4bf358467bfef4b2b4e2' 
  AND token = 'GsTt9CqEtAs6i9cepMh16B6SvqAS1boKPd9F+4nkIW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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