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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a030169b49be55d6d84fcb375e4202d3a839c04e354a088147dd3876f8956c11' 
  AND token = '9Di031JZ8cXid+r8xWgSGjk5FYq0YpLK/LGZ/0G3+/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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