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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce61118e53f901df5cb5ea7b70e3e78b542798da406594d7efab3e89fbe67ed' 
  AND token = 'NyF7K531quR0m5TbshRcAIsAL8lIjRd/040Fee4PAfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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