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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd931041ae577172acc74750d476a70d19367d06a08946304fd0b1b359f3975' 
  AND token = 'kX8WG6Fxx8oBa75YSMpOhFKRn47b9NJFl6iyhmtJS8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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