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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f624fa06c3bb2bc476bbe50ca8c9c39929e489833d0f3e759e27d05c354c72' 
  AND token = 'Wn+wzPXffHAI1/fFhUBxiRbl3fTMTTXKqvP8R5sUf+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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