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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb6c94bf7bacd3722a50ae0782e9592200064b43a474571af73abffe68acab9' 
  AND token = '8LxYcpa2yvCF5k7IwqWiJ/qoMUJacD6jkURzjM60WvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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