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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c985de5d18300d6bafe44e4a6a45b0615ba2aaad848c73922d3895e9f70bed' 
  AND token = 'sgbVrKnjdXMJKIQyFzalRay5ULMFhh68JSkTI9j7IRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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