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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa7630fab2bd1e97a4545b42ecebc3550b4534b4cc088cca0ff70413b9441da' 
  AND token = 'QP32dyshD9o1hU4sGPbr7Fkx6PF/yddCBmfFTw/ZQvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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