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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bd85c8c50433035068e4511c84a592bb923f1bf8bd29c347402c49423de259' 
  AND token = '/T6HSnMLm/rwKE8HMgIhemINQZmoKKx+iCnh9SrC7Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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