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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a722e4c8e4f4480e2062921d5b56a3de2e69b83cdf82a752b8412eab3e05473' 
  AND token = '0zlIUdr88TVEb0Xl2wXO8nXU70cVeP7jVQYuxCg8MN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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