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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e163992e10218c325bfe1913882de49025105526d7ff861ede92f9e7e35f57' 
  AND token = 'K1Dc9C/y/1Y6/0Sbannj+YsjThnJ2vYF9t6WHs5TWAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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