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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202cd05fc5e0a9797d972e7b5b27d6388d1ce14fef9ec4b446613017d770e0d8' 
  AND token = 'LEII19T5Mo92E8L3bAdMOG0QKFJV61d1LziZW3KxkH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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