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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b95efa91a3f155f6f0b9146e03b010d09c8e73ef680b2b7a4386d410ee90844' 
  AND token = 'WQAJhbFo6iIZUE7Eo0ZQqLE/8dk0Hlwr+96zdaXroLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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