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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f2178cf2133134611837071be09b0c0538cf0e43a04a87be4b50c50b00b1dbd' 
  AND token = 'Oud/OakhMgDUrDf7lUxN1Sl6aK2W5BAq8HVxXeSVY1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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