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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b96f6c9ec8c03c5e80768e530e13886e11e0114b0e2e33cd2b1a849a2076c87' 
  AND token = '5swWj5MV/5qlHFX9I1trv4YfrC201yBf7muK76YEIFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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