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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea79e4bbfbb56347b2273b6f3aa28374f6a8bf75696cb6a4a4be60ddc620366' 
  AND token = 'CUznxOO7dsBU+yaP+/Ac3HXTzLYqbDRbrkGPsTxS+to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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