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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed90ab89ddf2a91a42d186c0eaad1c10efb070a90a2efa2dc60c0c5360045bdd' 
  AND token = 'i3hEdsvU5w9apjNXDylOHtpEwMVmqTWxBZI6lfMv5nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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