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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be4c40a9f4fa0351b18293628adf38ac0475e90c0fceddbf85ab8cc6d2a3b38' 
  AND token = 'cLCniX76gQXAYA6bqWQoKnNDYfOGzOqNMSK0otGymg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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