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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6ab7c0fe21753529fd5d875dfd9c9527c251e55c91af73305567d4fc8eeeb2' 
  AND token = '2w8Yhvf9PKjd8eb927KoiT670fz3ea5uQwVqBCLAIIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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