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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85d5d1362253bc11f2dc910da9932ef1adf6a804617d88e79c6611fc67ff37d' 
  AND token = 'Ty/uhBWht4T9QnzN4RUM2incfppUN9v7wIny8CEKKv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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