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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f2198060bdae2d369eeb53d7d8affb4f15db6143f414993cd7478d673082d9' 
  AND token = '37KARLxWgEJeO/e7fyhXU90vVJJjf3Uf8TYxuYharY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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