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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '181c5cf2c28a8e9cc5cfcb585ef7c3dbc7810b651f023ecdb1ac85c409ebbc3e' 
  AND token = 'Moj7+CZQ43s9R4ss5/9vjSF756B2JPYggFQfSsZM/bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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