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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0c2ea6cdc7ae23083dfeda05622e4a51c95621ae94b057e95f324655435a1f' 
  AND token = '06Zw5jMl90rBIM3qn2qOJ+Zrl6NUMgdq68kjtXtl6U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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